CPAN::Dependency 0.15

CPAN::Dependency is a Perl module that can process a set of distributions, up to the whole CPAN, and extract the dependency relations between these distributions. Alternatively, it can load the prerequisites information from a CPANTS database.

It also calculates a score for each distribution based on the number of times it appears in the prerequisites of other distributions. The algorithm is described in more details in "SCORE CALCULATION".

CPAN::Dependency stores the data in an internal structure which can be saved and loaded using save_deps_tree() and load_deps_tree(). The structure looks like this:

 DEPS_TREE = {
 DIST => {
 author => STRING,
 cpanid => STRING,
 score => NUMBER,
 prereqs => {
 DIST => BOOLEAN,
 ...
 },
 used_by => {
 DIST => BOOLEAN,
 ...
 },
 },
 ....
 }

With each distribution name DIST are associated the following fields:

 * author is a string which contains the name of the author who wrote (or last released) this distribution;
 * cpanid is a string which contains the CPAN ID of the author who wrote (or last released) this distribution;
 * score is a number which represents the score of the distribution;
 * prereqs is a hashref which represents the prerequisites of the distribution; each key is a prerequisite name and its value is a boolean which is true when the distribution and the prerequisite are not from the same author;
 * used_by is a hashref which represents the distributions which use this particular distribution; each key is a distribution name and its value is a boolean which is true when both distributions are not from the same author.

SYNOPSIS

Find and print the 10 most required CPAN distributions by stand-alone processing.

 use CPAN::Dependency;

 my $cpandep = CPAN::Dependency->new(process => ALL_CPAN);
 $cpandep->run; # this may take some time..
 $cpandep->calculate_score;

 my %score = $cpandep->score_by_dists;
 my @dists = sort { $score{$b} $score{$a} } keys %score;
 print "Top 10 modules
";
 for my $dist (@dists[0..9]) {
 printf "] %s
", $score{$dist}, $dist;
 }

Same thing, but this time by loading the prerequisites information from the CPANTS database.

 use CPAN::Dependency;
 my $cpandep = new CPAN::Dependency;
 $cpandep->load_cpants_db(file => 'cpants.db');
 $cpandep->calculate_score;

 my %score = $cpandep->score_by_dists;
 my @dists = sort { $score{$b} $score{$a} } keys %score;
 print "Top 10 modules
";
 for my $dist (@dists[0..9]) {
 printf "] %s
", $score{$dist}, $dist;
 }


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